VAA and VSS Asymmetry in IRS2092 Class D Amplifier

I’m using an IRS2092 to amplify input voltage. The output load is 3.6 Ω. I’m using the application diagram proposed in the datasheet but switching is not happening and the issue seems to be with VAA voltage. According to the datasheet, there are 2 Zener diodes (6 V reverse voltage, one between VAA and GND, the other one between GND and VSS) so that if VAA sinks a certain amount of current (1 to 11 mA), these diodes will become reverse-biased, hence they maintain a 12 V difference between VAA and VSS (this is what I understood from the datasheet, please correct me if I’m wrong).

In my test, VAA is almost zero with respect to GND in spite of the fact that it is draining an almost 12 mA current and VSS is almost -7.5 V (9 mA current). My questions are “what is the cause of the issue?” and “how can I fix it?”

Also, a 12 V supply is used to establish VGS voltages. Due to high current draining from this supply, it cannot provide the supposed voltage and it is reduced to almost 3 V and I don’t know what the cause is.

by thuesh
September 07, 2022
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